Enables transcription corepressor activity. Predicted to be involved in cell population proliferation; histone H3-K36 demethylation; and histone H3-K4 demethylation. Predicted to act upstream of or within regulation of cell population proliferation. Located in cytosol and nucleus. Part of transcription regulator complex. Is expressed in renal cortex; submandibular gland primordium; tail dorsal root ganglion; telencephalon ventricular layer; and thymus primordium. Orthologous to human RIOX2 (ribosomal oxygenase 2). [provided by Alliance of Genome Resources, Apr 2022]